CN110429981A - It is shown based on LED and the hiding information Transmission system and method for visible light communication - Google Patents
It is shown based on LED and the hiding information Transmission system and method for visible light communication Download PDFInfo
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- CN110429981A CN110429981A CN201910747138.0A CN201910747138A CN110429981A CN 110429981 A CN110429981 A CN 110429981A CN 201910747138 A CN201910747138 A CN 201910747138A CN 110429981 A CN110429981 A CN 110429981A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
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Abstract
It is shown based on LED and the hiding information Transmission system and method for visible light communication the invention discloses a kind of, system includes hiding information input module, display content input module, Information Embedding and signal modulation module, LED driver module, LED display, high speed optoelectronic sensing/detector and signal demodulation and information extraction modules, the hiding information input module, display content input module are connected with Information Embedding with signal modulation module respectively, and Information Embedding is connected with driver module, LED display again with signal modulation module；The visible light signal issued is by being received and converted to electric signal by high speed optoelectronic sensing/detector after space channel propagation, while high speed optoelectronic sensing/detector is demodulated with signal and information extraction modules are connected；The present invention dual-purpose, Information hiding, the advantage to economize on resources with a screen, can be used for hiding advertisement, public information push, traffic information guide, conference electronic handbook etc..
Description
Technical field
The present invention relates to optic communications and field of image recognition, and in particular to is shown based on LED hiding with visible light communication
The information transmission system and method.
Background technique
LED display is widely used in the fields such as advertising media, Physical Culture Institute's venue, stage background, municipal works, at
One for LED application field maturation the most segments market.By years development, LED display application technology is had been achieved for
Significant progress, small spacing, abnormity screen, function screen become new increased requirement point.
At the same time, with the development and application of LED semiconductor light source technology, LED based visible light communication is as one
The novel short-distance wireless communication technology of kind has become following indoor important one of the wireless access technology.Visible light communication is with can
It is light-exposed to be used as signal vehicle, so that it is issued human eye quick light and shade blinking light inconspicuous to realize nothing by modulating LED
Linear light communication function shines so that LED light source has and communicates dual-purpose advantage.
It usually all contains multiple LED on LED display to shine/display element, these elements can equally be used for reality
Existing visible light communication, to realize display and communicate dual-purpose function.
Summary of the invention
The shortcomings that it is a primary object of the present invention to overcome the prior art and insufficient, provide it is a kind of based on LED show with can
The hiding information Transmission system and method for light-exposed communication are shown hiding information fast modulation to LED using visible light communication technology
Show on element, it is made to broadcast human eye quick light and shade flash signal inconspicuous while normally display image/video, thus
Display and communication function are realized simultaneously, and information transmission is not discovered by human eye, achieve the purpose that hiding information is transmitted.
In order to achieve the above object, the invention adopts the following technical scheme:
It is shown and the hiding information Transmission system of visible light communication the present invention is based on LED, including hiding information input module,
Show content input module, Information Embedding and signal modulation module, LED driver module, LED display, high-speed light fax
Sense/detector and signal demodulation and information extraction modules, the hiding information input module, display content input module difference
Be connected with Information Embedding with signal modulation module, Information Embedding and signal modulation module again with driver module, LED display
It is connected, visible light signal will be issued on the display element of signal modulation to be sent to LED display；The visible light signal issued
Electric signal, while the high speed optoelectronic are received and converted to by high speed optoelectronic sensing/detector after propagating by space channel
Sensing/detector is demodulated with signal and information extraction modules are connected；
The hiding information input module, the digital information of the higher rate for inputting transmission to be concealed；
The display content input module, for inputting the image/view for needing the relatively low rate shown on LED display
Frequency content；
The Information Embedding and signal modulation module, for hiding information to be transmitted to be implanted in content to be displayed simultaneously
Synthesis modulated signal is generated to be modulated on the display element of LED display；
The LED driver module, for the display element of modulated signal driving LED display will to be synthesized；
The LED display, display element is shone by synthesis modulated signal driving, thus show image/video content,
Hiding information is broadcasted with the imperceptible flash signal of human eye simultaneously；
High speed optoelectronic sensing/the detector, the visible light signal issued for obtaining LED display are acquired
The hiding information that content and higher rate are shown compared with the image/video of low rate is contained in optical signal；
The signal demodulation and information extraction modules, it is visible received by high speed optoelectronic sensing/detector for demodulating
Optical signal extracts the hiding information of reduction to restore composite signal from composite signal.
As a preferred technical solution, the demodulating process of signal demodulation and information extraction modules include envelope detection and
Sampling judgement, when high speed optoelectronic sensor/detector receives LEDi(t) after signal, to LEDi(t) signal is handled, and is first passed through
It crosses envelope detection and obtains envelope waveform, then adjudicated using sampling, determine that receiving symbol is " 1 " or " 0 "；Assuming that decision gate
It is limited to d, when signal sampling setting is greater than d, is adjudicated as " 1 " code；When signal sampling value is less than d, adjudicate as " 0 " code, judgement
Modulated signal s is obtained after the completioni(t), hiding information is finally exported.
The high speed optoelectronic sensor/detector uses cmos image sensor as a preferred technical solution, due to volume
There is time division multiplexing in curtain effect, therefore the frame picture obtained includes the signal of different moments, as a waveform, so only needing
Picture handle and can restore hiding information, detailed process: the picture gray processing first obtained to it leaves behind brightness letter
Breath, is then filtered, to inhibit noise, what is obtained is b waveform, resets threshold value and carries out binaryzation to picture, obtains
To be c waveform, be convenient for subsequent signal extraction, binaryzation formula are as follows:
Wherein, T is the threshold value chosen, fiFor original image, giResult after indicating binaryzation；
After obtaining the result of binaryzation, it is only necessary to light and shade information, as hiding " 1 ", " 0 " information are extracted, after decoding
Just obtain the information that hiding information input module is hidden.
As a preferred technical solution, the hiding information input module first hiding information to be transmitted be converted into two into
" 0 ", " 1 " signal of system.
The Information Embedding method following formula of the Information Embedding and signal modulation module as a preferred technical solution,
Description:
pi×si(t)=LEDi(t), [1, N] i ∈
Wherein, piIt is the brightness value of the ith pixel point of image/video frame to be shown, N is picture in image/video frame
The number of vegetarian refreshments；si(t) be at any time t variation the transmission to be concealed that be implanted to ith pixel point digital information, LEDi
(t) composite signal for both being, is the modulated signal that will be shown on ith pixel point, and t changes at any time；siIt (t) is two
Binary digits signal, value are " 0 " or " 1 ", therefore, LEDi(t) value are as follows:It is real
Show transmission information s to be concealedi(t) it is modulated to picture element signal p to be showniIt is upper to synthesize modulated signal LED to generatei(t)
Function.
The LED display is the LED display for supporting fast refresh as a preferred technical solution, is modulated in synthesis
Signal LEDi(t) control is ordered, and t issues the visible light signal that quick light and shade flashes to pixel i at any time, and pixel is fast
Fast light and shade variation is not discovered by human eye, thus while showing image/video frame pixel content entrained by broadcast
Hiding information.
It is shown and the method for the hiding information Transmission system of visible light communication, packet the present invention also provides a kind of based on LED
Include following step:
The digital information of the higher rate of transmission to be concealed is inputted by hiding information input module；
It is inputted in the image/video for needing the relatively low rate shown on LED display by display content input module
Hold；
Using Information Embedding and signal modulation module, hiding information to be transmitted is implanted in content to be displayed and is generated
Modulated signal is synthesized to be modulated on the display element of LED display；
Using high speed optoelectronic sensing/detector, obtains the visible light that LED display is broadcasted and hide signal.
High speed optoelectronic sensing/detector is demodulated with signal and information extraction modules are connected, for demodulating photoelectric sensor
The visible light signal that module obtains accurately extracts the hiding information of reduction.
It is described as a preferred technical solution, that hiding information to be transmitted is implanted in content to be displayed and generates synthesis
To be modulated on the display element of LED display, Information Embedding method is described modulated signal with following formula:
pi×si(t)=LEDi(t), [1, N] i ∈
Wherein, piIt is the brightness value of the ith pixel point of image/video frame to be shown, N is picture in image/video frame
The number of vegetarian refreshments；si(t) be at any time t variation the transmission to be concealed that be implanted to ith pixel point digital information, LEDi
(t) composite signal for both being, is the modulated signal that will be shown on ith pixel point, and t changes at any time；siIt (t) is two
Binary digits signal, value are " 0 " or " 1 ", therefore, LEDi(t) value are as follows:It is real
Show transmission information s to be concealedi(t) it is modulated to picture element signal p to be showniIt is upper to synthesize modulated signal LED to generatei(t)
Function.
Before the high speed optoelectronic sensing/detector is placed in LED display as a preferred technical solution, believed by space
The visible light signal that LED display is broadcasted in road is converted to electric signal, realizes LED display and high speed optoelectronic sensing/detection
The physical layer link of device transmits.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) LED screen is as a kind of Message Display Terminal, because its luminous efficiency is high, flexible in configuration, and long service life, extensively
It is used in the places such as all types of enterprises, square, market, airport.It is shown the invention proposes one kind based on LED and visible light is logical
The new method of the hiding information transmission of letter, has the advantages that " display communicate dual-purpose ", for the place of some advertising space anxieties,
The advantage that one screen is mostly used, economizes on resources can be more played, can be used for conference electronic handbook, hide advertisement, public information push, hand over
Communication breath guide etc..Therefore, application prospect is very wide.
(2) present invention also has the function of Information hiding, can be used for covert communications, the transmission of careless information etc., plays guarantor
Protect the effect of communication security.
Detailed description of the invention
Fig. 1 is to show the device figure with the transmission of the hiding information of visible light communication based on LED in the present embodiment；
Fig. 2 is the schematic diagram of signal modulation in the present embodiment；
Fig. 3 is the schematic diagram that signal is reconciled in the present embodiment；
Fig. 4 is waveform diagram in the present embodiment mediation process；
Fig. 5 is to show the flow chart with the transmission of the hiding information of visible light communication based on LED in the present embodiment；
Fig. 6 is the schematic diagram that hiding information is modulated to LED display element；
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in Figure 1, the present embodiment is shown based on LED and the hiding information Transmission system of visible light communication, including hide
MIM message input module, display content input module, Information Embedding and signal modulation module, LED driver module, LED are shown
Screen, high speed optoelectronic sensing/detector and signal demodulate and information extraction modules, in the hiding information input module, display
Hold input module to be connected with Information Embedding with signal modulation module respectively, Information Embedding and signal modulation module drive with display again
Module, LED display are connected, and will issue visible light signal on the display element of signal modulation to be sent to LED display；It is sent out
Visible light signal out is by being received and converted to electric signal by high speed optoelectronic sensing/detector after space channel propagation, together
Shi Suoshu high speed optoelectronic sensing/detector is demodulated with signal and information extraction modules are connected；
The hiding information input module, the digital information of the higher rate for inputting transmission to be concealed；It is described to hide
Hiding information to be transmitted is first converted into binary " 0 ", " 1 " signal by MIM message input module
The display content input module, for inputting the image/view for needing the relatively low rate shown on LED display
Frequency content；
The Information Embedding and signal modulation module, for hiding information to be transmitted to be implanted in content to be displayed simultaneously
Synthesis modulated signal is generated to be modulated on the display element of LED display；The letter of the Information Embedding and signal modulation module
Breath method for implantation is described with following formula:
pi×si(t)=LEDi(t), [1, N] i ∈
Wherein, piIt is the brightness value of the ith pixel point of image/video frame to be shown, N is picture in image/video frame
The number of vegetarian refreshments；si(t) be at any time t variation the transmission to be concealed that be implanted to ith pixel point digital information, LEDi
(t) composite signal for both being, is the modulated signal that will be shown on ith pixel point, and t changes at any time；siIt (t) is two
Binary digits signal, value are " 0 " or " 1 ", therefore, LEDi(t) value are as follows:It is real
Show transmission information s to be concealedi(t) it is modulated to picture element signal p to be showniIt is upper to synthesize modulated signal LED to generatei(t)
Function
The LED driver module, for the display element of modulated signal driving LED display will to be synthesized；
The LED display, display element is shone by synthesis modulated signal driving, thus show image/video content,
Hiding information is broadcasted with the imperceptible flash signal of human eye simultaneously；The LED display is that the LED of fast refresh is supported to show
Screen, in synthesis modulated signal LEDi(t) control is ordered, and t issues the visible light signal that quick light and shade flashes to pixel i at any time,
And the quick light and shade variation of pixel is not discovered by human eye, thus in the same of display image/video frame pixel content
When the entrained hiding information of broadcast.
High speed optoelectronic sensing/the detector, the visible light signal issued for obtaining LED display are acquired
The hiding information that content and higher rate are shown compared with the image/video of low rate is contained in optical signal；
The signal demodulation and information extraction modules, it is visible received by high speed optoelectronic sensing/detector for demodulating
Optical signal extracts the hiding information of reduction to restore composite signal from composite signal.
Signal demodulation and information extraction modules, since modulation system is that OOK is modulated, detailed process as shown in Fig. 2, its
Demodulating process be modulation inverse process, including envelope detection, sampling judgement and etc..When high speed optoelectronic sensor/detector connects
Receive LEDi(t) after signal, it is handled, advanced envelope detection excessively waits until envelope waveform, then adjudicated using sampling,
It can determine that receiving symbol is " 1 " or " 0 ".Assuming that decision threshold is d, when signal sampling setting is greater than d, adjudicate as " 1 "
Code；When signal sampling value is less than d, adjudicate as " 0 " code.It has adjudicated and modulated signal s just can be obtainedi(t), finally output is hidden
Information.Detailed process is as indicated at 3.
The waveform of demodulating process is as shown in figure 4, if the high speed optoelectronic sensor/detector used is adopted as cmos image biography
Sensor.Due to roller shutter effect, there is time division multiplexing, therefore the frame picture obtained includes the signal of different moments, as a wave
Shape.So hiding information can be restored by only needing to carry out picture to handle.Detailed process: the picture gray processing that first it is obtained
Luminance information is left behind, is then filtered, to inhibit noise, what is obtained is b waveform.Reset threshold value to picture into
Row binaryzation, what is obtained is c waveform, is convenient for subsequent signal extraction in this way.
Wherein, T is the threshold value chosen, fiFor original image, giResult after indicating binaryzation.
After obtaining the result of binaryzation, it is only necessary to light and shade information, as hiding " 1 ", " 0 " information are extracted, after decoding
Just obtain the information that hiding information input module is hidden.
As shown in figure 5, the present embodiment is shown based on LED and the hiding information transmission method of visible light communication, including following
Step:
Step 1: the digital information of the higher rate of transmission to be concealed is inputted by hiding information input module.
Step 2: by display content input module input need shown on LED display relatively low rate image/
Video content.
Step 3: utilizing Information Embedding and signal modulation module, hiding information to be transmitted is implanted in content to be displayed
And synthesis modulated signal is generated to be modulated on the display element of LED display.Specifically, as shown in fig. 6, Information Embedding method
It is described with following formula:
pi×si(t)=LEDi(t), [1, N] i ∈
Wherein, piIt is the brightness value of the ith pixel point of image/video frame to be shown, N is picture in image/video frame
The number of vegetarian refreshments；si(t) be at any time t variation the transmission to be concealed that be implanted to ith pixel point digital information, LEDi
(t) composite signal for both being, is the modulated signal that will be shown on ith pixel point, and t changes at any time.siIt (t) is two
Binary digits signal, possible value are " 0 ", " 1 ", therefore, LEDi(t) value are as follows:It realizes transmission information s to be concealedi(t) it is modulated to picture element signal p to be showniOn
To generate synthesis modulated signal LEDi(t) function.
Step 4: hiding information input module, display content input module respectively with Information Embedding and signal modulation module phase
Even, Information Embedding is connected with driver module, LED display again with signal modulation module.Wherein, driver module is used for
The display element of modulated signal driving LED display will be synthesized, LED display supports fast refresh, it is by synthesis modulated signal
LEDi(t) driving enables pixel i t issues the visible light signal of quick light and shade flashing at any time, and the quick light and shade of pixel becomes
Change is not discovered by human eye, to realize hidden entrained by broadcast while showing image/video frame pixel content
Hide information.
Step 5: utilizing high speed optoelectronic sensing/detector, obtain the visible light that LED display is broadcasted and hide signal.It will
Before it is placed in LED display, electric signal is converted to by the visible light signal that space channel is broadcasted LED display, is realized
LED display and high speed optoelectronic sensing/detector physical layer link transmit.
Step 6: high speed optoelectronic sensing/detector being demodulated with signal and information extraction modules are connected, for demodulating photoelectricity
The visible light signal that sensor module obtains accurately extracts the hiding information of reduction.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. being shown and the hiding information Transmission system of visible light communication based on LED, which is characterized in that input mould including hiding information
Block, display content input module, Information Embedding and signal modulation module, LED driver module, LED display, high speed optoelectronic
Sensing/detector and signal demodulation and information extraction modules, the hiding information input module, display content input module point
It is not connected with Information Embedding with signal modulation module, Information Embedding and signal modulation module are shown with driver module, LED again
Screen is connected, and will issue visible light signal on the display element of signal modulation to be sent to LED display；The visible light letter issued
Electric signal, while the high-speed light be received and converted to by high speed optoelectronic sensing/detector after number propagating by space channel
Fax sense/detector is demodulated with signal and information extraction modules are connected；
The hiding information input module, the digital information of the higher rate for inputting transmission to be concealed；
The display content input module, for inputting in the image/video for needing the relatively low rate shown on LED display
Hold；
The Information Embedding and signal modulation module, for hiding information to be transmitted to be implanted in content to be displayed and generate
Modulated signal is synthesized to be modulated on the display element of LED display；
The LED driver module, for the display element of modulated signal driving LED display will to be synthesized；
The LED display, display element is shone by synthesis modulated signal driving, to show image/video content, simultaneously
Hiding information is broadcasted with the imperceptible flash signal of human eye；
High speed optoelectronic sensing/the detector, the visible light signal issued for obtaining LED display, acquired light letter
The hiding information that content and higher rate are shown compared with the image/video of low rate is contained in number；
The signal demodulation and information extraction modules, for demodulating the letter of visible light received by high speed optoelectronic sensing/detector
Number to restore composite signal, and the hiding information of reduction is extracted from composite signal.
2. being shown and the method for the hiding information Transmission system of visible light communication, feature based on LED according to claim 1
It is, the demodulating process of the signal demodulation and information extraction modules includes envelope detection and sampling judgement, when high-speed light fax
Sensor/detector receives LEDi(t) after signal, to LEDi(t) signal is handled, and is first passed through envelope detection and is obtained Envelop waves
Then shape adjudicates using sampling, determines that receiving symbol is " 1 " or " 0 "；Assuming that decision threshold is d, when signal sampling is arranged
When greater than d, adjudicate as " 1 " code；It when signal sampling value is less than d, adjudicates as " 0 " code, modulated signal s is obtained after the completion of judgementi
(t), hiding information is finally exported.
3. being shown and the method for the hiding information Transmission system of visible light communication, feature based on LED according to claim 2
It is, there is time division multiplexing due to roller shutter effect using cmos image sensor in the high speed optoelectronic sensor/detector, because
This frame picture obtained includes the signal of different moments, as a waveform, so only needing to carry out picture to handle and can restore
Hiding information, detailed process: the picture gray processing first obtained to it leaves behind luminance information, is then filtered, from
And inhibit noise, what is obtained is b waveform, resets threshold value and carries out binaryzation to picture, and what is obtained is c waveform, convenient for subsequent
Signal extraction, binaryzation formula are as follows:
Wherein, T is the threshold value chosen, fiFor original image, giResult after indicating binaryzation；
After obtaining the result of binaryzation, it is only necessary to light and shade information, as hiding " 1 ", " 0 " information are extracted, it must after decoding
The information hidden to hiding information input module.
4. being shown and the hiding information Transmission system of visible light communication based on LED according to claim 1, which is characterized in that
Hiding information to be transmitted is first converted into binary " 0 ", " 1 " signal by the hiding information input module.
5. being shown and the hiding information Transmission system of visible light communication based on LED according to claim 1, which is characterized in that
The Information Embedding method of the Information Embedding and signal modulation module is described with following formula:
pi×si(t)=LEDi(t), [1, N] i ∈
Wherein, piIt is the brightness value of the ith pixel point of image/video frame to be shown, N is pixel in image/video frame
Number；si(t) be at any time t variation the transmission to be concealed that be implanted to ith pixel point digital information, LEDiIt (t) is two
The composite signal of person is the modulated signal that will be shown on ith pixel point, and t changes at any time；siIt (t) is binary number
Word signal, value are " 0 " or " 1 ", therefore, LEDi(t) value are as follows:Realizing will
Transmission information s to be concealedi(t) it is modulated to picture element signal p to be showniIt is upper to synthesize modulated signal LED to generatei(t) function.
6. being shown and the hiding information Transmission system of visible light communication based on LED according to claim 1, which is characterized in that
The LED display is the LED display for supporting fast refresh, in synthesis modulated signal LEDi(t) control is ordered pixel i
T issues the visible light signal of quick light and shade flashing at any time, and the quick light and shade variation of pixel is not discovered by human eye,
To broadcast entrained hiding information while showing image/video frame pixel content.
7. being shown and the hiding information Transmission system of visible light communication described in any one of -6 based on LED according to claim 1
Method, which is characterized in that include the following steps:
The digital information of the higher rate of transmission to be concealed is inputted by hiding information input module；
Pass through the image/video content for the relatively low rate that display content input module input needs to show on LED display；
Using Information Embedding and signal modulation module, hiding information to be transmitted is implanted in content to be displayed and generates synthesis
Modulated signal is to be modulated on the display element of LED display；
Using high speed optoelectronic sensing/detector, obtains the visible light that LED display is broadcasted and hide signal.
High speed optoelectronic sensing/detector is demodulated with signal and information extraction modules are connected, for demodulating photoelectric sensor module
Obtained visible light signal accurately extracts the hiding information of reduction.
8. being shown and the method for the hiding information Transmission system of visible light communication, feature based on LED according to claim 7
Be, it is described hiding information to be transmitted is implanted in content to be displayed and generate synthesis modulated signal shown with being modulated to LED
On the display element of display screen, Information Embedding method is described with following formula:
pi×si(t)=LEDi(t), [1, N] i ∈
Wherein, piIt is the brightness value of the ith pixel point of image/video frame to be shown, N is pixel in image/video frame
Number；si(t) be at any time t variation the transmission to be concealed that be implanted to ith pixel point digital information, LEDiIt (t) is two
The composite signal of person is the modulated signal that will be shown on ith pixel point, and t changes at any time；siIt (t) is binary number
Word signal, value are " 0 " or " 1 ", therefore, LEDi(t) value are as follows:Realizing will
Transmission information s to be concealedi(t) it is modulated to picture element signal p to be showniIt is upper to synthesize modulated signal LED to generatei(t) function.
9. being shown and the method for the hiding information Transmission system of visible light communication, feature based on LED according to claim 7
Be, before the high speed optoelectronic sensing/detector is placed in LED display, by space channel by LED display broadcasted can
Light-exposed signal is converted to electric signal, realizes that LED display and high speed optoelectronic sensing/detector physical layer link transmit.
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| CN113162927A (en) * | 2021-04-19 | 2021-07-23 | 维沃移动通信有限公司 | Data transmission method, sending terminal, receiving terminal and electronic equipment |
| CN114677956A (en) * | 2022-03-28 | 2022-06-28 | 暨南大学 | Long-distance real-time display camera communication system and method |
| CN116846472A (en) * | 2023-09-01 | 2023-10-03 | 北京圣传创世科技发展有限公司 | Visible light communication method between television screen and smart phone |
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